git-cat-file <root
GIT-CAT-FILE(1)                             Git Manual                            GIT-CAT-FILE(1)

NAME
       git-cat-file - Provide content or type and size information for repository objects

SYNOPSIS
       git cat-file (-t [--allow-unknown-type]| -s [--allow-unknown-type]| -e | -p |  | --textconv ) 
       git cat-file (--batch | --batch-check) [--follow-symlinks]

DESCRIPTION
       In its first form, the command provides the content or the type of an object in the
       repository. The type is required unless -t or -p is used to find the object type, or -s is
       used to find the object size, or --textconv is used (which implies type "blob").

       In the second form, a list of objects (separated by linefeeds) is provided on stdin, and
       the SHA-1, type, and size of each object is printed on stdout.

OPTIONS
       
           The name of the object to show. For a more complete list of ways to spell object
           names, see the "SPECIFYING REVISIONS" section in gitrevisions(7).

       -t
           Instead of the content, show the object type identified by .

       -s
           Instead of the content, show the object size identified by .

       -e
           Suppress all output; instead exit with zero status if  exists and is a valid
           object.

       -p
           Pretty-print the contents of  based on its type.

       
           Typically this matches the real type of  but asking for a type that can
           trivially be dereferenced from the given  is also permitted. An example is to
           ask for a "tree" with  being a commit object that contains it, or to ask for a
           "blob" with  being a tag object that points at it.

       --textconv
           Show the content as transformed by a textconv filter. In this case,  has be of
           the form :, or : in order to apply the filter to the content
           recorded in the index at .

       --batch, --batch=
           Print object information and contents for each object provided on stdin. May not be
           combined with any other options or arguments. See the section BATCH OUTPUT below for
           details.

       --batch-check, --batch-check=
           Print object information for each object provided on stdin. May not be combined with
           any other options or arguments. See the section BATCH OUTPUT below for details.

       --batch-all-objects
           Instead of reading a list of objects on stdin, perform the requested batch operation
           on all objects in the repository and any alternate object stores (not just reachable
           objects). Requires --batch or --batch-check be specified. Note that the objects are
           visited in order sorted by their hashes.

       --buffer
           Normally batch output is flushed after each object is output, so that a process can
           interactively read and write from cat-file. With this option, the output uses normal
           stdio buffering; this is much more efficient when invoking --batch-check on a large
           number of objects.

       --allow-unknown-type
           Allow -s or -t to query broken/corrupt objects of unknown type.

       --follow-symlinks
           With --batch or --batch-check, follow symlinks inside the repository when requesting
           objects with extended SHA-1 expressions of the form tree-ish:path-in-tree. Instead of
           providing output about the link itself, provide output about the linked-to object. If
           a symlink points outside the tree-ish (e.g. a link to /foo or a root-level link to
           ../foo), the portion of the link which is outside the tree will be printed.

           This option does not (currently) work correctly when an object in the index is
           specified (e.g.  :link instead of HEAD:link) rather than one in the tree.

           This option cannot (currently) be used unless --batch or --batch-check is used.

           For example, consider a git repository containing:

               f: a file containing "hello\n"
               link: a symlink to f
               dir/link: a symlink to ../f
               plink: a symlink to ../f
               alink: a symlink to /etc/passwd

           For a regular file f, echo HEAD:f | git cat-file --batch would print

               ce013625030ba8dba906f756967f9e9ca394464a blob 6

           And echo HEAD:link | git cat-file --batch --follow-symlinks would print the same
           thing, as would HEAD:dir/link, as they both point at HEAD:f.

           Without --follow-symlinks, these would print data about the symlink itself. In the
           case of HEAD:link, you would see

               4d1ae35ba2c8ec712fa2a379db44ad639ca277bd blob 1

           Both plink and alink point outside the tree, so they would respectively print:

               symlink 4
               ../f

               symlink 11
               /etc/passwd

OUTPUT
       If -t is specified, one of the .

       If -s is specified, the size of the  in bytes.

       If -e is specified, no output.

       If -p is specified, the contents of  are pretty-printed.

       If  is specified, the raw (though uncompressed) contents of the  will be
       returned.

BATCH OUTPUT
       If --batch or --batch-check is given, cat-file will read objects from stdin, one per line,
       and print information about them. By default, the whole line is considered as an object,
       as if it were fed to git-rev-parse(1).

       You can specify the information shown for each object by using a custom . The
        is copied literally to stdout for each object, with placeholders of the form
       %(atom) expanded, followed by a newline. The available atoms are:

       objectname
           The 40-hex object name of the object.

       objecttype
           The type of of the object (the same as cat-file -t reports).

       objectsize
           The size, in bytes, of the object (the same as cat-file -s reports).

       objectsize:disk
           The size, in bytes, that the object takes up on disk. See the note about on-disk sizes
           in the CAVEATS section below.

       deltabase
           If the object is stored as a delta on-disk, this expands to the 40-hex sha1 of the
           delta base object. Otherwise, expands to the null sha1 (40 zeroes). See CAVEATS below.

       rest
           If this atom is used in the output string, input lines are split at the first
           whitespace boundary. All characters before that whitespace are considered to be the
           object name; characters after that first run of whitespace (i.e., the "rest" of the
           line) are output in place of the %(rest) atom.

       If no format is specified, the default format is %(objectname) %(objecttype)
       %(objectsize).

       If --batch is specified, the object information is followed by the object contents
       (consisting of %(objectsize) bytes), followed by a newline.

       For example, --batch without a custom format would produce:

            SP  SP  LF
            LF

       Whereas --batch-check='%(objectname) %(objecttype)' would produce:

            SP  LF

       If a name is specified on stdin that cannot be resolved to an object in the repository,
       then cat-file will ignore any custom format and print:

            SP missing LF

       If --follow-symlinks is used, and a symlink in the repository points outside the
       repository, then cat-file will ignore any custom format and print:

           symlink SP  LF
            LF

       The symlink will either be absolute (beginning with a /), or relative to the tree root.
       For instance, if dir/link points to ../../foo, then  will be ../foo.  is
       the size of the symlink in bytes.

       If --follow-symlinks is used, the following error messages will be displayed:

            SP missing LF

       is printed when the initial symlink requested does not exist.

           dangling SP  LF
            LF

       is printed when the initial symlink exists, but something that it (transitive-of) points
       to does not.

           loop SP  LF
            LF

       is printed for symlink loops (or any symlinks that require more than 40 link resolutions
       to resolve).

           notdir SP  LF
            LF

       is printed when, during symlink resolution, a file is used as a directory name.

CAVEATS
       Note that the sizes of objects on disk are reported accurately, but care should be taken
       in drawing conclusions about which refs or objects are responsible for disk usage. The
       size of a packed non-delta object may be much larger than the size of objects which delta
       against it, but the choice of which object is the base and which is the delta is arbitrary
       and is subject to change during a repack.

       Note also that multiple copies of an object may be present in the object database; in this
       case, it is undefined which copy’s size or delta base will be reported.

GIT
       Part of the git(1) suite

Git 2.7.4                                   03/23/2016                            GIT-CAT-FILE(1)

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